Middle support is short and doesn't touch floor (like another reviewer reported). Top shelf uneven/warped because of middle support raised too high. 
Instructions AWFUL - put together and un put together several times because instructions were too vague/non specific and difficult to see. Wayfair air is getting the seller to reach out with better instructions, it won't help with the problems at this point.
Very disappointed as I spent many hours searching for the right dimensions - these were perfect. Wasted several hours on assembling. 
However, dimensions as are as I needed, so... 
If you are short on time and/or patience, considered adding the cost of "professional assembly". especially if they guarantee all parts fit as needed.